continents were joined as a single landmass called Pangaea and broke apart 200 million years ago and slowly moved to their present positions

13.

Is a change in earths magnetic field

14.

one of the two plates is descending beneath the other in a process

Down

2.

Earth's crust and rigid upper mantle are broken into enormous slabs called plates

4.

A place where two plates slide horizontally past each other

5.

Is a line on a map that connects points that have the same age

8.

The study of this Magnetic record Is called

11.

the weight of the uplifted ridge is though to push an oceanic plate toward the trench formed at the subduction zone

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